the cnn news room continues at the top of the hour, with martin savage filling in for don lemon. keep it here for sanjay gupta. >>> everywhere you look, it seems a heart attack is just waiting to happen. more than a million heart attacks a year. that is one just about every 30 seconds, just in the united states. if you haven't had a heart attack yourself, you likely know someone who has. well, i have a secret to share. with what we know right now we could see the last heart attack in america. i have been investigating this for over a year. i have lessons to share. things you need to know, things your doctor may not tell you. i'm a pretty typical guy in his early 40s with a family history of heart disease. so i decided to go on a mission to never have a heart attack. but how? this doctor has guaranteed he can see trouble coming, years in advance. >> here is where the blood is flowing, and this is the lining. >> reporter: agatson is using an ultrasound to look for plaque in the artery, a blockage here would be a sign i'm at increased risk of a heart attack. >> unless you do the ima